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JOURNALS // Trudy Instituta Matematiki i Mekhaniki UrO RAN // Archive

Trudy Inst. Mat. i Mekh. UrO RAN, 2024 Volume 30, Number 4, Pages 149–169 (Mi timm2134)

Fibonacci representations of braid groups

Ph. G. Korablevab

a N.N. Krasovskii Institute of Mathematics and Mechanics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg
b Chelyabinsk State University

Abstract: A family of representations is constructed for the braid group $B_n$. The vector spaces on which the braid group acts are defined as the result of identifying the spaces generated by proper colorings of regular trees of degree $3$ with a marked vertex. This identification is done using a family of canonical isomorphisms. The dimensions of the resulting spaces form the sequence of Fibonacci numbers. We then show how the constructed representations can be extended to invariants of unoriented knots and links in a 3-sphere.

Keywords: braid group, representation, knot invariant, Reshetikhin–Turaev type invariant.

UDC: 515.162

MSC: 57M27, 57M25

Received: 10.02.2024
Revised: 28.07.2024
Accepted: 05.08.2024

DOI: 10.21538/0134-4889-2024-30-4-149-169



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© Steklov Math. Inst. of RAS, 2025